Pearson eText Principles of Human Physiology -- Instant Access (Pearson+)
Pearson eText Principles of Human Physiology -- Instant Access (Pearson+)
6th Edition
ISBN: 9780135213001
Author: Cindy Stanfield
Publisher: PEARSON+
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Chapter 5, Problem 1E
Summary Introduction

Introduction:

Arachidonic acids are the regulatory molecules present in the phospholipids of the plasma membrane. They are polyunsaturated omega-6 fatty acids. It is abundant in the brain, muscles, and liver. It is a key inflammatory intermediate and acts as a vasodilator.

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Answer to Problem 1E

Correct answer:

Among the answers given, the correct answer is option c) eicosanoids.

Explanation of Solution

Explanation for the correct answer:

The option (c) is eicosanoids. the arachidonic acid is converted into the eicosanoids by the action of certain enzymes. Cyclooxygenase (COX) is required in the conversion of arachidonic acid into the prostaglandins. On the other hand, lipoxygenase is required in the conversion of arachidonic acid into the leukotrienes. The function of eicosanoids is to give an immune response to the body.

Explanation for the incorrect answer:

The option (a) is amines. The amines are the derivatives of the ammonia. We can replace hydrogen atoms of the ammonia with the carbon groups, so that, we can get an amine. Hence, this option is incorrect.

The option (b) is thyroid hormones. Thyroid hormones are the thyroxine-based hormones and have precursor thyroglobulin. Hence, this option is incorrect.

The option (d) is steroids. Steroids are the hormones that help in the metabolism, maintain salt-water balance, immune functions, and development of sex characteristics. Its precursor is cholesterol. Hence, this option is incorrect.

The option (e) is peptides. Peptides are the group of amino acids that are linked by the peptide bonds. So, peptides are made up of the amino acid units. Hence, this option is incorrect.

Conclusion

Hence, the arachidonic acid is the raw material for the eicosanoids. So, the correct option is c).

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